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1·How often do you brush your teeth?

你多久刷一次牙？《柯林斯英汉双解大词典》

2·It's a good habit to brush your teeth after a meal.

饭后刷牙是个好习惯。

3·It's good for you to brush your teeth twice a day.

一天刷两次牙对你有好处。

4·Turn the tap off while you soap your hands or brush your teeth.

洗手或刷牙时把水龙头关掉。

5·Don't eat too much, and remember to brush your teeth after you eat it!

不要吃太多，吃完要记得刷牙！

6·The germs can get into your teeth and damage them unless you brush your teeth.

除非你刷牙，否则细菌会进入你的牙齿并破坏它们。

7·Brush your teeth with toothpaste.

用牙膏刷牙。

8·You must brush your teeth everyday.

你必须每天刷牙。

9·How often should you brush your teeth?

一天应该刷几次牙？

10·When you brush your teeth, do a good job.

当你刷牙的时候，好好刷。